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Make more threading improvements

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- ASAN memory morgue is now lockless
- Make C11 atomics header more portable
- Rewrote pthread keys support to be lockless
- Simplify Python's unicode table unpacking code
- Make crash report write(2) closer to being atomic
- Make it possible to strace/ftrace a single thread
- ASAN now checks nul-terminated strings fast and properly
- Windows fork() now restores TLS memory of calling thread
This commit is contained in:
Justine Tunney 2022-11-01 22:36:03 -07:00
parent d7b88734cd
commit e522aa3a07
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GPG key ID: BE714B4575D6E328
189 changed files with 1363 additions and 1217 deletions
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29
libc/log/backtrace2.c
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@ -17,38 +17,25 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/rusage.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/calls/syscall_support-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/fmt/conv.h"
#include "libc/fmt/fmt.h"
#include "libc/fmt/itoa.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/promises.internal.h"
#include "libc/intrin/safemacros.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/log/backtrace.internal.h"
#include "libc/log/color.internal.h"
#include "libc/log/log.h"
#include "libc/mem/alg.h"
#include "libc/mem/bisectcarleft.internal.h"
#include "libc/mem/gc.internal.h"
#include "libc/nexgen32e/gc.internal.h"
#include "libc/nexgen32e/stackframe.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/stack.h"
#include "libc/runtime/symbols.internal.h"
#include "libc/stdio/append.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/fileno.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/sig.h"
#include "libc/thread/tls.h"
#include "libc/x/x.h"
#define kBacktraceMaxFrames 128
#define kBacktraceBufSize ((kBacktraceMaxFrames - 1) * (18 + 1))
@ -58,7 +45,6 @@ static void ShowHint(const char *s) {
}
static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
bool ok;
ssize_t got;
intptr_t addr;
size_t i, j, gi;
@ -110,6 +96,9 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
garbage = __tls_enabled ? __get_tls()->tib_garbages : 0;
gi = garbage ? garbage->i : 0;
for (frame = bp; frame && i < kBacktraceMaxFrames - 1; frame = frame->next) {
if (kisdangerous(frame)) {
return -1;
}
addr = frame->addr;
if (addr == _weakaddr("__gc")) {
do {
@ -158,7 +147,7 @@ static int PrintBacktraceUsingAddr2line(int fd, const struct StackFrame *bp) {
got -= p3 - p1;
p1 += p3 - p1;
} else {
write(2, p1, got);
sys_write(2, p1, got);
break;
}
}
@ -189,12 +178,12 @@ static int PrintBacktrace(int fd, const struct StackFrame *bp) {
void ShowBacktrace(int fd, const struct StackFrame *bp) {
#ifdef __FNO_OMIT_FRAME_POINTER__
/* asan runtime depends on this function */
--__ftrace;
--__strace;
ftrace_enabled(-1);
strace_enabled(-1);
if (!bp) bp = __builtin_frame_address(0);
PrintBacktrace(fd, bp);
++__strace;
++__ftrace;
strace_enabled(+1);
ftrace_enabled(+1);
#else
(fprintf)(stderr, "ShowBacktrace() needs these flags to show C backtrace:\n"
"\t-D__FNO_OMIT_FRAME_POINTER__\n"